''If the doors of perception were cleansed everything would appear to man as it is,infinite.''

William Blake (1757-1827), British poet, painter, engraver. The Marriage of Heaven and Hell, plate 14, "A Memorable Fancy," (c. 1793), repr. In Complete Writings, ed. Geoffrey Keynes (1957).
"The Doors of Perception" was the title of Aldous Huxley's essay on his experience with mescaline (1954); the 1960s rock group The Doors also reputedly took their name from Blake's aphorism. Blake continued, "For man has closed himself up, till he sees all things thro' narrow chinks of his cavern."